let myMap = new Map();
let myKey = {
    readMe: '这个是一个map Key'
};
let myValue = '这个value';

myMap.set(myKey, myValue);
console.log(myMap);
console.log(myMap.get(myKey));
myMap.clear();
for (let [key, value] of myMap.entries()) {
    console.log(JSON.stringify(key) + '=' + value);
}